Calibre 2236 Is fitted with a Syloxi hairspring that is produced by Rolex and patented. This silicon hairspring has a patented geometry that guarantees the calibre’s regularity in almost any placement. Meanwhile, Graham has also ventured beyond their comfort and ease zone with some bigger echelon items. Their Orrery Tourbillon, https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/